package com.example.wu.listviewtext;

import android.content.Intent;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import java.lang.reflect.Array;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements IOnDelListener{
    private ListView stuListView;
    private ArrayList<Student> studentArrayList = new ArrayList<>();
    private ArrayList<Student> searchResultList = new ArrayList<>();
    private stuAdapter adapter;
    private Button btnAddStu;

    private EditText edtKeyword;
    private Button btnSearch;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initStuArrayList();
        initAdapter();
        initListView();
        initAddBtn();
        initSearchView();
    }

    /**
     * 初始化搜索模块
     */
    private void initSearchView() {
        edtKeyword = findViewById(R.id.edt_keyword);
        btnSearch = findViewById(R.id.btn_search);

        btnSearch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String keyword = edtKeyword.getText().toString().trim();
                //使用学生列表和关键字 得到搜索结果列表
                search(studentArrayList,keyword);
                adapter.changeData(searchResultList);
            }
        });

        edtKeyword.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {
                String keyword = edtKeyword.getText().toString().trim();
                //使用学生列表和关键字，得到搜索结果列表
                search(studentArrayList,keyword);
                adapter.changeData(searchResultList);
            }
        });
    }

    /**
     * 使用学生列表和关键字 得到搜索结果列表
     * @param studentArrayList
     * @param keyword
     */
    private void search(ArrayList<Student> studentArrayList, String keyword) {
        searchResultList.clear();
        for (int i = 0; i < studentArrayList.size(); i++){
            Student s = studentArrayList.get(i);
            //如果学生姓名包含关键字，这个学生就加入了结果列表
            if (s.getName().contains(keyword)){
                searchResultList.add(s);
            }
            //如果学生年龄等于关键字，这个学生就加入了结果列表
            else if (String.valueOf(s.getAge()).equals(keyword)){
                searchResultList.add(s);
            }
        }
    }

    /**
     *  初始化添加学生按钮
     */
    private void initAddBtn() {
        btnAddStu = findViewById(R.id.btn_addStu);
        btnAddStu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent();
                intent.setClass(MainActivity.this,
                        AddActivity.class);
                startActivityForResult(intent,1001);
            }
        });
    }

    /**
     *  初始化ListView
     */
    private void initListView() {
        stuListView = findViewById(R.id.list_view);
        
        stuListView.setAdapter(adapter);

        stuListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                //对studentArrayList.get(i)进行封装
                Student s = studentArrayList.get(i);
                Toast.makeText(MainActivity.this,
                        "姓名:"+s.getName() + "   " + " 年龄:"
                                +  s.getAge(),
                        Toast.LENGTH_SHORT)
                        .show();

                Intent intent = new Intent();
                intent.setClass(MainActivity.this,
                        EditActivity.class);
                intent.putExtra("NAME",s.getName());
                intent.putExtra("AGE",s.getAge());
                intent.putExtra("IMGID",s.getImgId());
                intent.putExtra("INDEX",i);
                startActivityForResult(intent,1002);
            }
        });
    }

    /**
     * 初始化适配器
     */
    private void initAdapter() {
        adapter = new stuAdapter(MainActivity.this,
                studentArrayList,MainActivity.this);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        Log.e("MainActivity",
                "requestCode = " + requestCode + "resultCode = " + resultCode);

        if (data == null){
            return;
        }

        if (resultCode == 2001) {
            String name = data.getStringExtra("NAME");
            int age = data.getIntExtra("AGE", 0);
            int imgId = data.getIntExtra("IMG", R.drawable.dog1);

            Student s = new Student(imgId, name, age);
            studentArrayList.add(s);
            adapter.notifyDataSetChanged();
        }else if(resultCode == 3001){
            String name = data.getStringExtra("NAME");
            int age = data.getIntExtra("AGE",0);
            int imgId = data.getIntExtra("IMG",R.drawable.dog1);
            int index = data.getIntExtra("INDEX",0);

            //封装studentArrayList.get(index)
            Student s = studentArrayList.get(index);
            s.setName(name);
            s.setAge(age);
            s.setImgId(imgId);

            adapter.notifyDataSetChanged();
        }
    }

    //初始化学生列表
    private void initStuArrayList() {
        Student s1 = new Student(R.drawable.dog1,"张一",18);
        Student s2 = new Student(R.drawable.dog2,"张二",19);
        Student s3 = new Student(R.drawable.dog3,"张三",20);
        Student s4 = new Student(R.drawable.dog4,"张四",21);
        Student s5 = new Student(R.drawable.dog5,"张五",22);

        studentArrayList.add(s1);
        studentArrayList.add(s2);
        studentArrayList.add(s3);
        studentArrayList.add(s4);
        studentArrayList.add(s5);


    }

    @Override
    public void del(int i) {
        Log.e("MainActivity"," del " + i);
        studentArrayList.remove(i);
        adapter.notifyDataSetChanged();
    }
}
